CN105301476A - Signal testing device for printed circuit board - Google Patents
Signal testing device for printed circuit board Download PDFInfo
- Publication number
- CN105301476A CN105301476A CN201510661010.4A CN201510661010A CN105301476A CN 105301476 A CN105301476 A CN 105301476A CN 201510661010 A CN201510661010 A CN 201510661010A CN 105301476 A CN105301476 A CN 105301476A
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- China
- Prior art keywords
- switch
- described multiple
- terminal
- lead
- circuit board
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
- G01R31/2808—Holding, conveying or contacting devices, e.g. test adapters, edge connectors, extender boards
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The invention discloses a signal testing device for a printed circuit board. The signal testing device includes a plurality of input terminals for receiving external test signals, a plurality of output terminals for providing the external test signals for the printed circuit board, a plurality of switches which are arranged on paths between the plurality of input terminals and the plurality of output terminals and are used for controllably coupling the plurality of input terminals to the plurality of output terminals, an ammeter used for measuring a current value on a first selected path according to the action of the plurality of switches, and a voltage meter used for measuring a voltage value on a second selected path according to the action of the plurality of switches. With the signal testing device adopted, a measuring process can be simplified, and the automation degree of measurement can be improved.
Description
Technical field
The present invention relates to technical field of measurement and test, relate in particular to a kind of signal-testing apparatus for printed circuit board (PCB).
Background technology
Electronic product (such as, display panel) debugging or finally dispatch from the factory check in, the problem of the existing signal analysis instrument of such as oscillograph and so on is complicated operation, causes meeting Production requirement.
Fig. 1 shows the printed circuit board (PCB) (PCB) of the display panel of a kind of liquid crystal display (LCD).Integrated due to PCB, there is plurality of test points in it, and make in finally dispatching from the factory and checking, operator must measure its electrical characteristics (such as, electric current, voltage etc.) singly by finding be intended to PCB test point.This process is quite loaded down with trivial details.
Therefore, a kind of signal-testing apparatus of the improvement for printed circuit board (PCB) is needed.
Summary of the invention
Advantageously, provide a kind of signal-testing apparatus for printed circuit board (PCB), it can simplified measurement process, improves the automaticity measured.
According to an aspect of the present invention, provide a kind of signal-testing apparatus for printed circuit board (PCB), comprising:
Multiple input terminal, for receiving external test signal;
Multiple lead-out terminal, for external test signal described in described P.e.c. Plate supplying;
Multiple switch, is arranged on the path between described multiple input terminal and described multiple lead-out terminal, for controllably described multiple input terminal being coupled to described multiple lead-out terminal;
Reometer, for measuring the current value on the first selected path according to the action of described multiple switch; And
Voltage table, for measuring the magnitude of voltage on the second selected path according to the action of described multiple switch.
Alternatively, described multiple switch can comprise multiple first switch, one end of each in described multiple first switch is connected to corresponding one in described multiple input terminal, and the other end of each in described multiple first switch is connected to corresponding one in described multiple lead-out terminal.
Alternatively, described multiple switch can comprise the second switch for one of described multiple input terminal being optionally connected to the first end of described reometer and be used for one of described multiple lead-out terminal to be optionally connected to the 3rd switch of the second end of described reometer.
Alternatively, described second switch and described 3rd switch can be configured to action by this way and make to there is one-to-one relationship between described multiple input terminal and described multiple lead-out terminal.
Alternatively, described multiple first switch, described second switch and described 3rd switch can be configured such that, when in described multiple first switch disconnects, the input terminal of the first switch corresponding to this disconnection is coupled to the lead-out terminal of the first switch corresponding to this disconnection by described second switch and described 3rd switch via described reometer.
Alternatively, in the first switch multiple described in any given time only one be disconnected.
Alternatively, described multiple switch can comprise the 4th switch, and for one of described multiple lead-out terminal being optionally connected to the first end of described voltage table, the second end of described voltage table is connected to a reference terminal on described printed circuit board (PCB).
Alternatively, described 4th switch can be configured to and described second switch and described 3rd switch synchronization action, measures the magnitude of voltage on this selected path while the current value that described voltage table is always measured on a selected path at described reometer.
Alternatively, at least one in described multiple switch can be mechanical switch or analog switch.
Alternatively, described multiple switch is all analog switch, and described signal-testing apparatus also comprises controller, and this controller is by providing corresponding control signal to control its duty to the control terminal of these analog switches.
Alternatively, described controller controls each analog switch and carries out action to make it possible to carry out electric current and voltage measurement with specific order to each paths.
Alternatively, described printed circuit board (PCB) can be the printed circuit board (PCB) of LCD.
According to drawings and Examples described hereinafter, these and other aspect of the present invention will be well-known, and be illustrated with reference to embodiment described hereinafter.
Accompanying drawing explanation
Fig. 1 shows a kind of printed circuit board (PCB) of display panel of liquid crystal display;
Fig. 2 illustrates a kind of according to an embodiment of the invention signal-testing apparatus for printed circuit board (PCB).
Embodiment
Below in conjunction with accompanying drawing, various embodiments of the present invention are described in detail.
In PCB test, usually need to supply a set of test signal to this PCB, this test signal can be the pumping signal allowing this PCB normally to work.Under the excitation of test signal, PCB can carry out operating to present specific electrical characteristics arranging in interface thereon.By testing these electrical characteristics (such as, electric current, voltage etc.) and itself and desired value being compared, can determine whether this PCB there occurs fault.
Fig. 2 illustrates a kind of according to an embodiment of the invention signal-testing apparatus 200 for printed circuit board (PCB).As shown in the figure, this signal-testing apparatus 200 can comprise multiple input terminal in_1, in_2, in_3 ... in_n, multiple lead-out terminal out_1, out_2, out_3 ... out_n, multiple K switch 1, K2, K3, K4, reometer (representing with " A " in figure) and voltage table (representing with " V " in figure).Input terminal in_1, in_2, in_3 ... in_n may be used for receiving external test signal.Multiple lead-out terminal may be used for external test signal described in P.e.c. Plate supplying to be tested.K switch 1, K2, K3, K4 is arranged at described input terminal in_1, in_2, in_3 ... in_n and described lead-out terminal out_1, out_2, out_3 ... on path between out_n.Under the control of these switches, each input terminal in_1, in_2, in_3 ... in_n is controllably coupled to lead-out terminal out_1, out_2, out_3 ... out_n.Reometer can measure the current value on the first selected path according to the action of described switch.Voltage table can measure the magnitude of voltage on the second selected path according to the action of described switch.First selected path can be identical or different with the second selected path.
In the illustrated example shown in fig. 2, one end of each in multiple first K switch 1 is connected to multiple input terminal in_1, in_2, in_3 ... corresponding one in in_n, and the other end of each in multiple first K switch 1 is connected to multiple lead-out terminal out_1, out_2, out_3 ... corresponding one in out_n.Further, second switch K2 is by multiple input terminal in_1, in_2, in_3 ... one of in_n is optionally connected to the first end of reometer, and the 3rd K switch 3 is by multiple lead-out terminal out_1, out_2, out_3 ... one of out_n is optionally connected to the second end of reometer.
In one implementation, second switch K2 and the 3rd K switch 3 are configured to action by this way and make multiple input terminal in_1, in_2, in_3 ... in_n and multiple lead-out terminal out_1, out_2, out_3 ... one-to-one relationship is there is between out_n.Such as, if second switch K2 is switched to input terminal in_1, then the 3rd K switch 3 can be switched to lead-out terminal out_1; If second switch K2 is switched to input terminal in_2, then the 3rd K switch 3 can be switched to lead-out terminal out_2, and the rest may be inferred.When in multiple first K switch 1 disconnects, the input terminal of the first K switch 1 corresponding to this disconnection is coupled to the lead-out terminal of the first K switch 1 corresponding to this disconnection by second switch K2 and the 3rd K switch 3 via reometer.Such as, nethermost first K switch 1 disconnects, and now the input terminal in_1 of the first K switch 1 corresponding to this disconnection is coupled to the lead-out terminal out_1 of the first K switch 1 corresponding to this disconnection by second switch K2 and the 3rd K switch 3 via reometer.In other words, multiple first K switch 1 can cooperatively interact to select one article of specific path to carry out current measurement with second switch K2 and the 3rd K switch 3.
In one implementation, in multiple first K switch 1, only have a disconnection, and all the other K1 all connect with to lead-out terminal supply needed for test signal.Also namely, in multiple first K switch 1 of any given time only one be disconnected.As previously mentioned, the input terminal that the K1 of this disconnection is corresponding is coupled to corresponding lead-out terminal by means of second switch K2 and the 3rd K switch 3 via reometer, and printed circuit board (PCB) to be tested still can normally be worked.
In the illustrated example shown in fig. 2,4th K switch 4 may be used for lead-out terminal out_1, out_2, out_3 ... one of out_n is optionally connected to the first end of voltage table, and the second end of voltage table can be connected to a reference terminal ref on printed circuit board (PCB) to be tested.Thus, voltage table can be measured by the magnitude of voltage between the selected path of the 4th K switch 4 and this reference terminal ref.In one implementation, this reference terminal can be ground terminal.Especially, 4th K switch 4 can be configured to second switch K2 and the 3rd K switch 3(and corresponding first K switch 1 potentially) synchronously action, measure the magnitude of voltage on this same selected path while the current value that voltage table is always measured on a selected path at reometer.Certainly, in other implementations, situation can be really not so.
In previously described embodiment, at least one in K switch 1, K2, K3, K4 can be mechanical switch or analog switch.As an example, the first K switch 1 can be simple single-pole single-throw (SPST) (SPST) mechanical switch or the SPST analog switch realizing said function.As another example, second switch K2 can be that hilted broadsword is thrown (SPMT) mechanical switch more or realized the analog multichannel switch of said function.Particularly, the on-off element in analog switch can be relay, electronic switch etc. based on ambipolar or MOS transistor.When SPST analog switch, can be switched on or switched off by providing high level or low level to control it to the control terminal of this switch.When analog multichannel switch, can by providing an address code to select which passage to be switched on to multiple control terminals of this switch.The concrete structure of analog switch and principle of work are known in the art, and will not be described in detail at this.
In one implementation, K switch 1, K2, K3, K4 can be all analog switch.Such as, each in multiple first K switch 1 can realize with SPST analog switch, and second switch K2, the 3rd K switch 3 and the 4th K switch 4 can realize with analog multichannel switch.In this case, signal-testing apparatus can also comprise controller (not shown), and this controller provides corresponding control signal to control its duty to the control terminal of these analog switches.By way of example and not limitation, controller can be the flush bonding processor such as single-chip microcomputer, digital signal processor.
In one example, controller can gauge tap K1, K2, K3, K4 carries out action according to previously described mode, make when in multiple first K switch 1 disconnects, the input terminal of the first K switch 1 corresponding to this disconnection is coupled to the lead-out terminal of the first K switch 1 corresponding to this disconnection by second switch K2 and the 3rd K switch 3 via reometer.Also namely, multiple first K switch 1 can be controlled to second switch K2 and the 3rd K switch 3 and cooperatively interact to select one article of specific path to carry out current measurement.In addition, 4th K switch 4 can be controlled to second switch K2 and the 3rd K switch 3(and corresponding first K switch 1 potentially) synchronously action, measure the magnitude of voltage on this same selected path while the current value that voltage table can be measured on a selected path at reometer.Further, controller can control each analog switch and carries out action to make it possible to carry out electric current and voltage measurement with specific order (in the figure 2 example, such as, with order from top to bottom) to each paths.Can continue predetermined time section to the measurement of every paths, with handled easily, person records measured value.
In addition, in description above, printed circuit board (PCB) can be the printed circuit board (PCB) of LCD; But the present invention is not limited thereto.When the printed circuit board (PCB) of LCD, external test signal can be the PG signal that pattern maker (PatternGenerator) generates.PG signal is supplied to each interface on the printed circuit board (PCB) of LCD by previously described signal-testing apparatus, LCD can normally be worked.By the action of the switch in signal-testing apparatus, the electrical characteristics (such as, electric current, voltage etc.) that each interface of LCD presents can be tested, and and then itself and desired value be compared, to determine whether this LCD there occurs fault.It is appreciated of course that the present invention is applicable to test any printed circuit board (PCB).
Combine read accompanying drawing in view of description above, can become apparent for those skilled in the relevant art the various amendment of aforementioned exemplary embodiment of the present invention and changing.Any and all modifications will fall into of the present invention non-limiting with in the scope of exemplary embodiment.In addition, belong to these embodiments those skilled in the art of the present invention, after the instruction given by the description had benefited from above and relevant drawings, other embodiments of the present invention described here will be expected.
Therefore, should be appreciated that embodiments of the invention are not limited to disclosed specific embodiment, and amendment and other embodiment are also intended within the scope of the appended claims involved.Although employ particular term herein, they only use in general and descriptive sense, but not the object in order to limit.
Claims (12)
1., for a signal-testing apparatus for printed circuit board (PCB), comprising:
Multiple input terminal, for receiving external test signal;
Multiple lead-out terminal, for external test signal described in described P.e.c. Plate supplying;
Multiple switch, is arranged on the path between described multiple input terminal and described multiple lead-out terminal, for controllably described multiple input terminal being coupled to described multiple lead-out terminal;
Reometer, for measuring the current value on the first selected path according to the action of described multiple switch; And
Voltage table, for measuring the magnitude of voltage on the second selected path according to the action of described multiple switch.
2. device according to claim 1, wherein, described multiple switch comprises multiple first switch, one end of each in described multiple first switch is connected to corresponding one in described multiple input terminal, and the other end of each in described multiple first switch is connected to corresponding one in described multiple lead-out terminal.
3. device according to claim 2, wherein, described multiple switch comprises the second switch for one of described multiple input terminal being optionally connected to the first end of described reometer and is used for one of described multiple lead-out terminal to be optionally connected to the 3rd switch of the second end of described reometer.
4. device according to claim 3, wherein, described second switch and described 3rd switch are configured to action by this way and make to there is one-to-one relationship between described multiple input terminal and described multiple lead-out terminal.
5. device according to claim 4, wherein, described multiple first switch, described second switch and described 3rd switch are configured such that, when in described multiple first switch disconnects, the input terminal of the first switch corresponding to this disconnection is coupled to the lead-out terminal of the first switch corresponding to this disconnection by described second switch and described 3rd switch via described reometer.
6. device according to claim 5, wherein, in the first switch multiple described in any given time only one be disconnected.
7. device according to claim 3, wherein, described multiple switch comprises the 4th switch, and for one of described multiple lead-out terminal being optionally connected to the first end of described voltage table, the second end of described voltage table is connected to a reference terminal on described printed circuit board (PCB).
8. device according to claim 7, wherein, described 4th switch is configured to and described second switch and described 3rd switch synchronization action, measures the magnitude of voltage on this selected path while the current value that described voltage table is always measured on a selected path at described reometer.
9. device according to claim 1, wherein, at least one in described multiple switch is mechanical switch or analog switch.
10. device according to claim 9, wherein, described multiple switch is all analog switch, and wherein, described signal-testing apparatus also comprises controller, and this controller is by providing corresponding control signal to control its duty to the control terminal of these analog switches.
11. devices according to claim 10, wherein, described controller controls each analog switch and carries out action to make it possible to carry out electric current and voltage measurement with specific order to each paths.
12. devices according to claim 1, wherein, described printed circuit board (PCB) is the printed circuit board (PCB) of LCD.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510661010.4A CN105301476B (en) | 2015-10-14 | 2015-10-14 | For the signal-testing apparatus of printed circuit board |
| PCT/CN2016/088804 WO2017063395A1 (en) | 2015-10-14 | 2016-07-06 | Signal testing device for printed circuit board |
| US15/325,838 US10036772B2 (en) | 2015-10-14 | 2016-07-06 | Signal testing apparatus for printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510661010.4A CN105301476B (en) | 2015-10-14 | 2015-10-14 | For the signal-testing apparatus of printed circuit board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105301476A true CN105301476A (en) | 2016-02-03 |
| CN105301476B CN105301476B (en) | 2018-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510661010.4A Active CN105301476B (en) | 2015-10-14 | 2015-10-14 | For the signal-testing apparatus of printed circuit board |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US10036772B2 (en) |
| CN (1) | CN105301476B (en) |
| WO (1) | WO2017063395A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017063395A1 (en) * | 2015-10-14 | 2017-04-20 | 京东方科技集团股份有限公司 | Signal testing device for printed circuit board |
| CN110398680A (en) * | 2019-08-14 | 2019-11-01 | 华芯电子(天津)有限责任公司 | A kind of PCB method for testing reliability |
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- 2015-10-14 CN CN201510661010.4A patent/CN105301476B/en active Active
-
2016
- 2016-07-06 WO PCT/CN2016/088804 patent/WO2017063395A1/en active Application Filing
- 2016-07-06 US US15/325,838 patent/US10036772B2/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| US20170292988A1 (en) | 2017-10-12 |
| CN105301476B (en) | 2018-06-22 |
| WO2017063395A1 (en) | 2017-04-20 |
| US10036772B2 (en) | 2018-07-31 |
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Address after: 100015 Jiuxianqiao Road, Beijing, No. 10, No. Applicant after: BOE Technology Group Co., Ltd. Applicant after: Beijing BOE Display Technology Co., Ltd. Address before: Beijing economic and Technological Development Zone 100176 Beijing Zelu 9 Applicant before: BOE Technology Group Co., Ltd. Applicant before: Beijing BOE Display Technology Co., Ltd. |
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